slave flash on Oly 720SW?

I've just taken delivery of my PT-033 housing for my Olympus stylus
720SW.
Its a neat unit and the price wasnt too bad either.
I have a Nikon SB105 undertwater flashgun which has a slave mode as
the housing doesnt have a TTL cord port.
I have been playing around this morning (above water) and find that
the SB105 triggers prefectly when the camera flash
fires........BUT........
when I have the combination of the camera flash + the nikon I
*expected* that the pictures might be over-exposed unitl I got the
settings worked out but the opposite is happening!

If the external slave flash tiggers the picture is too
dark........why.....? Any ideas why having two flashes go off
simulataneously could cause the picture to darken? Any tips for using
this combination with a slave flash?
Thanks
Al.

"scubaal" <al@blakes.net> wrote in message
news:1188707466.052554.195400@r29g2000hsg.googlegr oups.com...
> I've just taken delivery of my PT-033 housing for my Olympus stylus
> 720SW.
> Its a neat unit and the price wasnt too bad either.
> I have a Nikon SB105 undertwater flashgun which has a slave mode as
> the housing doesnt have a TTL cord port.
> I have been playing around this morning (above water) and find that
> the SB105 triggers prefectly when the camera flash
> fires........BUT........
> when I have the combination of the camera flash + the nikon I
> *expected* that the pictures might be over-exposed unitl I got the
> settings worked out but the opposite is happening!
>
> If the external slave flash tiggers the picture is too
> dark........why.....? Any ideas why having two flashes go off
> simulataneously could cause the picture to darken? Any tips for using
> this combination with a slave flash?

Does your camera have a pre-flash? That may be causing the problem.

"scubaal" <al@blakes.net> wrote in message
news:1188707466.052554.195400@r29g2000hsg.googlegr oups.com...
> I've just taken delivery of my PT-033 housing for my Olympus stylus
> 720SW.
> Its a neat unit and the price wasnt too bad either.
> I have a Nikon SB105 undertwater flashgun which has a slave mode as
> the housing doesnt have a TTL cord port.
> I have been playing around this morning (above water) and find that
> the SB105 triggers prefectly when the camera flash
> fires........BUT........
> when I have the combination of the camera flash + the nikon I
> *expected* that the pictures might be over-exposed unitl I got the
> settings worked out but the opposite is happening!
>
> If the external slave flash tiggers the picture is too
> dark........why.....? Any ideas why having two flashes go off
> simulataneously could cause the picture to darken? Any tips for using
> this combination with a slave flash?

Does your camera have a pre-flash? That may be causing the problem.

"scubaal" <al@blakes.net> wrote in message
news:1188707466.052554.195400@r29g2000hsg.googlegr oups.com...
> I've just taken delivery of my PT-033 housing for my Olympus stylus
> 720SW.
> Its a neat unit and the price wasnt too bad either.
> I have a Nikon SB105 undertwater flashgun which has a slave mode as
> the housing doesnt have a TTL cord port.
> I have been playing around this morning (above water) and find that
> the SB105 triggers prefectly when the camera flash
> fires........BUT........
> when I have the combination of the camera flash + the nikon I
> *expected* that the pictures might be over-exposed unitl I got the
> settings worked out but the opposite is happening!
>
> If the external slave flash tiggers the picture is too
> dark........why.....? Any ideas why having two flashes go off
> simulataneously could cause the picture to darken? Any tips for using
> this combination with a slave flash?

Does your camera have a pre-flash? That may be causing the problem.

"scubaal" <al@blakes.net> wrote in message
news:1188707466.052554.195400@r29g2000hsg.googlegr oups.com...
> I've just taken delivery of my PT-033 housing for my Olympus stylus
> 720SW.
> Its a neat unit and the price wasnt too bad either.
> I have a Nikon SB105 undertwater flashgun which has a slave mode as
> the housing doesnt have a TTL cord port.
> I have been playing around this morning (above water) and find that
> the SB105 triggers prefectly when the camera flash
> fires........BUT........
> when I have the combination of the camera flash + the nikon I
> *expected* that the pictures might be over-exposed unitl I got the
> settings worked out but the opposite is happening!
>
> If the external slave flash tiggers the picture is too
> dark........why.....? Any ideas why having two flashes go off
> simulataneously could cause the picture to darken? Any tips for using
> this combination with a slave flash?

Does your camera have a pre-flash? That may be causing the problem.

Your Olympus probably does have a preflash (or preflashes). I have a Stylus
500 that has 4 preflashes, if I remember correctly. Light is faster than you
think- by the time the real flash on the camera fires and the image is
rendered, the light from the SB105 is long gone. I have a Sea & Sea SL960D
that allows you to set the strobe to ignore the preflashes, and it fires
when the camera flash does. Not sure if there is a way around this with the
105.
"news" <jay@bottom-time-scuba.com> wrote in message
news:TskHi.87455$lZ7.40450@newsfe20.lga...
> "scubaal" <al@blakes.net> wrote in message
> news:1188707466.052554.195400@r29g2000hsg.googlegr oups.com...
>> I've just taken delivery of my PT-033 housing for my Olympus stylus
>> 720SW.
>> Its a neat unit and the price wasnt too bad either.
>> I have a Nikon SB105 undertwater flashgun which has a slave mode as
>> the housing doesnt have a TTL cord port.
>> I have been playing around this morning (above water) and find that
>> the SB105 triggers prefectly when the camera flash
>> fires........BUT........
>> when I have the combination of the camera flash + the nikon I
>> *expected* that the pictures might be over-exposed unitl I got the
>> settings worked out but the opposite is happening!
>>
>> If the external slave flash tiggers the picture is too
>> dark........why.....? Any ideas why having two flashes go off
>> simulataneously could cause the picture to darken? Any tips for using
>> this combination with a slave flash?
>
> Does your camera have a pre-flash? That may be causing the problem.
>
>

Your Olympus probably does have a preflash (or preflashes). I have a Stylus
500 that has 4 preflashes, if I remember correctly. Light is faster than you
think- by the time the real flash on the camera fires and the image is
rendered, the light from the SB105 is long gone. I have a Sea & Sea SL960D
that allows you to set the strobe to ignore the preflashes, and it fires
when the camera flash does. Not sure if there is a way around this with the
105.
"news" <jay@bottom-time-scuba.com> wrote in message
news:TskHi.87455$lZ7.40450@newsfe20.lga...
> "scubaal" <al@blakes.net> wrote in message
> news:1188707466.052554.195400@r29g2000hsg.googlegr oups.com...
>> I've just taken delivery of my PT-033 housing for my Olympus stylus
>> 720SW.
>> Its a neat unit and the price wasnt too bad either.
>> I have a Nikon SB105 undertwater flashgun which has a slave mode as
>> the housing doesnt have a TTL cord port.
>> I have been playing around this morning (above water) and find that
>> the SB105 triggers prefectly when the camera flash
>> fires........BUT........
>> when I have the combination of the camera flash + the nikon I
>> *expected* that the pictures might be over-exposed unitl I got the
>> settings worked out but the opposite is happening!
>>
>> If the external slave flash tiggers the picture is too
>> dark........why.....? Any ideas why having two flashes go off
>> simulataneously could cause the picture to darken? Any tips for using
>> this combination with a slave flash?
>
> Does your camera have a pre-flash? That may be causing the problem.
>
>

Your Olympus probably does have a preflash (or preflashes). I have a Stylus
500 that has 4 preflashes, if I remember correctly. Light is faster than you
think- by the time the real flash on the camera fires and the image is
rendered, the light from the SB105 is long gone. I have a Sea & Sea SL960D
that allows you to set the strobe to ignore the preflashes, and it fires
when the camera flash does. Not sure if there is a way around this with the
105.
"news" <jay@bottom-time-scuba.com> wrote in message
news:TskHi.87455$lZ7.40450@newsfe20.lga...
> "scubaal" <al@blakes.net> wrote in message
> news:1188707466.052554.195400@r29g2000hsg.googlegr oups.com...
>> I've just taken delivery of my PT-033 housing for my Olympus stylus
>> 720SW.
>> Its a neat unit and the price wasnt too bad either.
>> I have a Nikon SB105 undertwater flashgun which has a slave mode as
>> the housing doesnt have a TTL cord port.
>> I have been playing around this morning (above water) and find that
>> the SB105 triggers prefectly when the camera flash
>> fires........BUT........
>> when I have the combination of the camera flash + the nikon I
>> *expected* that the pictures might be over-exposed unitl I got the
>> settings worked out but the opposite is happening!
>>
>> If the external slave flash tiggers the picture is too
>> dark........why.....? Any ideas why having two flashes go off
>> simulataneously could cause the picture to darken? Any tips for using
>> this combination with a slave flash?
>
> Does your camera have a pre-flash? That may be causing the problem.
>
>

Your Olympus probably does have a preflash (or preflashes). I have a Stylus
500 that has 4 preflashes, if I remember correctly. Light is faster than you
think- by the time the real flash on the camera fires and the image is
rendered, the light from the SB105 is long gone. I have a Sea & Sea SL960D
that allows you to set the strobe to ignore the preflashes, and it fires
when the camera flash does. Not sure if there is a way around this with the
105.
"news" <jay@bottom-time-scuba.com> wrote in message
news:TskHi.87455$lZ7.40450@newsfe20.lga...
> "scubaal" <al@blakes.net> wrote in message
> news:1188707466.052554.195400@r29g2000hsg.googlegr oups.com...
>> I've just taken delivery of my PT-033 housing for my Olympus stylus
>> 720SW.
>> Its a neat unit and the price wasnt too bad either.
>> I have a Nikon SB105 undertwater flashgun which has a slave mode as
>> the housing doesnt have a TTL cord port.
>> I have been playing around this morning (above water) and find that
>> the SB105 triggers prefectly when the camera flash
>> fires........BUT........
>> when I have the combination of the camera flash + the nikon I
>> *expected* that the pictures might be over-exposed unitl I got the
>> settings worked out but the opposite is happening!
>>
>> If the external slave flash tiggers the picture is too
>> dark........why.....? Any ideas why having two flashes go off
>> simulataneously could cause the picture to darken? Any tips for using
>> this combination with a slave flash?
>
> Does your camera have a pre-flash? That may be causing the problem.
>
>

On Sep 19, 6:50 pm, "KV" <kvaug...@verizon.net> wrote:
> Your Olympus probably does have a preflash (or preflashes). I have a Stylus
> 500 that has 4 preflashes, if I remember correctly. Light is faster than you
> think- by the time the real flash on the camera fires and the image is
> rendered, the light from the SB105 is long gone. I have a Sea & Sea SL960D
> that allows you to set the strobe to ignore the preflashes, and it fires
> when the camera flash does. Not sure if there is a way around this with the
> 105."news" <j...@bottom-time-scuba.com> wrote in message
>
> news:TskHi.87455$lZ7.40450@newsfe20.lga...
>
> > "scubaal" <a...@blakes.net> wrote in message
> >news:1188707466.052554.195400@r29g2000hsg.googleg roups.com...
> >> I've just taken delivery of my PT-033 housing for my Olympus stylus
> >> 720SW.
> >> Its a neat unit and the price wasnt too bad either.
> >> I have a Nikon SB105 undertwater flashgun which has a slave mode as
> >> the housing doesnt have a TTL cord port.
> >> I have been playing around this morning (above water) and find that
> >> the SB105 triggers prefectly when the camera flash
> >> fires........BUT........
> >> when I have the combination of the camera flash + the nikon I
> >> *expected* that the pictures might be over-exposed unitl I got the
> >> settings worked out but the opposite is happening!
>
> >> If the external slave flash tiggers the picture is too
> >> dark........why.....? Any ideas why having two flashes go off
> >> simulataneously could cause the picture to darken? Any tips for using
> >> this combination with a slave flash?
>
> > Does your camera have a pre-flash? That may be causing the problem.

One way around it is to set the camera on manual. You might have to
test it a bit to find the right settings, but most cameras turn off
the pre-flash when set to manual.

gc